An email address can only belong to one contact. When updating a contact you'll be prompted to either Move or Merge the two.
Moving a Contact: Move one of the email addresses from one contact to another, while keeping both contacts in place.
Merging a Contact: Merge two contacts into one with all of the email addresses under one updated contact name.
*When merged, contacts emails will remain assigned to the groups they originally were, using the most recent contact name.
If you need help using your contact book, adding or importing contacts, or creating groups — check out this article.
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Need more help? Check out Basic Ving Troubleshooting